Replication task spontaneously started failing

[Glorious1]

I've had daily replication tasks of 5 data sets (one task for each) working smoothly for over a year now. They replicate to a backup volume on the localhost.
Yesterday, one of the five tasks started failing according to an email I got. Here's what the red alert in the WebGUI says this morning:

Code:

Replication Ark/Media -> localhost:ArkBak failed: Failed: Ark/Media (auto-20161002.0845-2w->auto-20161003.0845-2w)

There seems to be no space issue that I can see. The snapshots are being made daily without problem on the source volume. The other 4 tasks are still replicating just fine. The only thing that has changed is I updated to FreeNAS 9.10.1 a few days ago.

I would appreciate some help on how to diagnose this.

 

[depasseg]

This is the 5th-ish replication issue I've seen in the past week. I'm not sure if they are related, but I would open a bug.

 

[Glorious1]

OK, thanks depasseg
https://bugs.freenas.org/issues/17981

EDIT:
Was considered a duplicate of:
https://bugs.freenas.org/issues/17826
and a solution is 'ready for release'.

2nd EDIT:
And apparently it is in 9.10.1-U2, now released.

3rd EDIT
And my replications are back to working smoothly now.